FormFactor insider plans sale of 17,510 shares

Rule 144 filing shows planned sales of FormFactor common stock by Mike Slessor plus recent share-sale history.

Rhea-AI Filing Summary

FORMFACTOR, INC. (FORM) has a notice under Rule 144 indicating that Mike (Michael) David Slessor plans to sell common stock through Morgan Stanley Smith Barney LLC. The filing covers up to 6,412 shares of restricted stock and 11,098 performance share units, all dated August 1, 2025.

The notice also lists prior sales by Mike Slessor over the last three months, including 16,002 common shares on August 14, 2026 and 4,735 common shares on July 15, 2026, with corresponding aggregate values reported for each sale.

Key Figures

Total shares covered: 17,510 shares Restricted stock shares: 6,412 shares Performance share units: 11,098 shares +4 more

7 metrics

Total shares covered 17,510 shares Common shares covered by the Rule 144 notice

Restricted stock shares 6,412 shares Restricted stock listed to be sold, dated August 1, 2025

Performance share units 11,098 shares Performance shares listed to be sold, dated August 1, 2025

Recent sale shares (August 14, 2026) 16,002 shares Common shares sold in a single transaction

Aggregate value (August 14, 2026 sale) 2,095,492.30 Aggregate value for 16,002 common shares sold

Recent sale shares (July 15, 2026) 4,735 shares Common shares sold in a single transaction

Aggregate value (July 15, 2026 sale) 560,197.38 Aggregate value for 4,735 common shares sold

Key Terms

Rule 144, Restricted Stock, Performance Shares, NASDAQ

4 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Restricted Stock financial

"Common | 08/01/2025 | Restricted Stock | ISSUER"

Shares granted to an individual that carry limits on transfer or sale until certain conditions are met, such as staying with the company for a set time or hitting performance targets. Think of them as a locked gift that gradually opens; for investors they matter because they affect how many shares may enter the market later, signal management incentives and potential dilution, and reveal confidence in future company performance.

Performance Shares financial

"Common | 08/01/2025 | Performance Shares | ISSUER"

Performance shares are a type of company stock given to executives or employees that only become theirs if the company meets specific goals, like hitting certain profits or growth targets. They motivate leaders to work toward the company’s success, because their additional shares depend on achieving these results.

NASDAQ market

"78120725 | 09/16/2026 | NASDAQ"

The Nasdaq is a stock exchange where many companies' shares are bought and sold, functioning much like a marketplace for investments. It matters to investors because it provides a platform to buy and sell ownership stakes in companies, helping them track the value of those companies and make informed decisions. As one of the largest and most technology-focused markets, it also reflects trends and developments in the business world.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does the Rule 144 notice disclose for FORMFACTOR INC (FORM)?

The notice states that Mike (Michael) David Slessor intends to sell FormFactor common stock under Rule 144 through Morgan Stanley Smith Barney LLC, including restricted stock and performance shares dated August 1, 2025.

How many FORM (FormFactor) shares are covered by the planned Rule 144 sale?

The filing covers a total of 17,510 common shares, consisting of 6,412 restricted stock shares and 11,098 performance share units, all listed with an acquisition date of August 1, 2025.

What recent FormFactor (FORM) stock sales by Mike Slessor are disclosed?

The notice lists sales of 16,002 common shares on August 14, 2026 for an aggregate value of 2,095,492.30 and 4,735 common shares on July 15, 2026 for an aggregate value of 560,197.38.

Which broker is handling the planned Rule 144 sale for FORM stock?

The Rule 144 notice identifies Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, as the broker handling the planned sale of FormFactor common stock.

On which market is FormFactor (FORM) common stock listed in this notice?

The securities information section identifies the trading market as NASDAQ for the FormFactor common stock related to this Rule 144 filing.

Who is the person for whose account the FORM shares are to be sold?

The person for whose account the securities are to be sold is Mike (Michael) David Slessor, whose address is given as 7005 Southfront Road, Livermore, California 94551.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/16/2026 - 04:41 PM Accepted by SEC EDGAR 09/16/2026 - 04:41 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001590177
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	FORMFACTOR, INC.
SEC File Number	000-50307
Address of Issuer	7005 SOUTHFRONT ROAD LIVERMORE CALIFORNIA 94551
Phone	(925) 290-4000
Name of Person for Whose Account the Securities are To Be Sold	MIKE SLESSOR
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer
Relationship to Issuer	Director

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	17510	1833790.78	78120725	09/16/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	08/01/2025	Restricted Stock	ISSUER			6412	08/01/2025	Not Applicable
Common	08/01/2025	Performance Shares	ISSUER			11098	08/01/2025	Not Applicable

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
MIKE SLESSOR 7005 Southfront Road Livermore CA 94551	Common	08/14/2026	16002	2095492.30
MIKE SLESSOR 7005 Southfront Road Livermore CA 94551	Common	07/15/2026	4735	560197.38

144: Remarks and Signature

Remarks
Date of Notice	09/16/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	08/19/2025
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Mike (Michael) David Slessor
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)